Due to the change in the wind speed, the speed of the wind turbine rotor changes, so at the output we get variable AC supply which means we do not get exactly constant voltage and frequency.

It can be control by controlling shaft speed and at the output by varying the load (Resistance).

I need to submit a case study about that so tell me about any site or e-book where I can find comprehensive details about that.

There are a lot of energy issues happening there. Rural population with out electricity, consumption rates trippling, and alternative fuel sources, but how can I make a case study/ field study project into it.

Can you please give me a list of research project topics i could use.
(ie: Social effects of rural population not having access to electricity.)

Thanks!